Mop bucket



FIG. 1 is a front perspective view of a mop bucket in accordance with the present design;

FIG. 2 is a front view and a back view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof.

The broken lines are for illustrative purposes only and form no part of the claimed design. The shading represents contour of the claimed design. 

CLAIM The ornamental design for a mop bucket, as shown and described. 